Rather than sculpting a hunter could you make the figures out of gumpaste or fondant? Are they expecting a 3-D cake or are you talking about sculpting a sheetcake?
I have made some humorous hunting scene cakes in the past, but this sort of sounds like what you mean. Here is a link to the 3 duck hunting cakes on my website
http://sugarfrosted.com/thumbnails.php?album=search&type=full&search=hunting
The toppers are from Wilton, the frosting is all buttercream. A more creative person than myself could make those things from fondant or gumpaste.
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